Pockmarks in the Witch Ground Basin, Central North Sea

Pockmarks in the Witch Ground Basin, Central North Sea
复制标题

北海中部女巫地盆地的麻子

DOI:
10.1029/2018gc008068
复制
发表时间:
2019
期刊:
Geochemistry, Geophysics, Geosystems
影响因子:
--
通讯作者:
Böttner C
Böttner C
中科院分区:
--
文献类型:
--
作者:
Böttner C

文献摘要

参考文献

被引文献

相似文献

海洋沉积物中含有大量的甲烷(CH 4),这是一种潜在的温室气体。海洋沉积物甲烷释放的定量估计是稀缺的,一个约束不佳的时间变化导致甲烷排放情景的不确定性很大。在这里,我们使用2-D和3-D地震反射,多波束测深,地球化学和沉积学数据来(I)绘制和描述Witch地面盆地(北海中部)的麻点,(II)表征相关的沉积和流体迁移结构,(III)分析相关的甲烷释放。超过1,500个两种不同形态的麻点分布在225平方公里的面积上。这两个类别彼此独立地形成,并且对应于至少两个不同的流体源。1类麻点尺寸较大(>6 m深,>250 m长,>75 m宽),显示出活跃的排气,位于垂直流体管道上方,这些管道通过水力连接海底和深层甲烷源。2类麻点占所有麻点的99.5%,较小(0.9-3.1 m深,26-140 m长,14-57 m宽),仅限于Witch Ground Formation的软细粒沉积物,可能源于压实相关的脱水。女巫地形成中的埋藏麻点记录了麻点形成的不同阶段,可能是由冰川消退后与环境变化有关的外力引发的。因此,麻点田的温室气体排放不能基于麻点数量和当今通量,而是需要分析地质时期麻点形成过程。
Marine sediments host large amounts of methane (CH4), which is a potent greenhouse gas. Quantitative estimates for methane release from marine sediments are scarce, and a poorly constrained temporal variability leads to large uncertainties in methane emission scenarios. Here, we use 2‐D and 3‐D seismic reflection, multibeam bathymetric, geochemical, and sedimentological data to (I) map and describe pockmarks in the Witch Ground Basin (central North Sea), (II) characterize associated sedimentological and fluid migration structures, and (III) analyze the related methane release. More than 1,500 pockmarks of two distinct morphological classes spread over an area of 225 km2. The two classes form independently from another and are corresponding to at least two different sources of fluids. Class 1 pockmarks are large in size (>6 m deep, >250 m long, and >75 m wide), show active venting, and are located above vertical fluid conduits that hydraulically connect the seafloor with deep methane sources. Class 2 pockmarks, which comprise 99.5% of all pockmarks, are smaller (0.9–3.1 m deep, 26–140 m long, and 14–57 m wide) and are limited to the soft, fine‐grained sediments of the Witch Ground Formation and possibly sourced by compaction‐related dewatering. Buried pockmarks within the Witch Ground Formation document distinct phases of pockmark formation, likely triggered by external forces related to environmental changes after deglaciation. Thus, greenhouse gas emissions from pockmark fields cannot be based on pockmark numbers and present‐day fluxes but require an analysis of the pockmark forming processes through geological time.
DOI: 10.1016/j.margeo.2012.07.006
发表时间: 2012-12-01
期刊: MARINE GEOLOGY
影响因子: 2.9
作者:
Andresen, Katrine Juul
通讯作者: Andresen, Katrine Juul
北海中部钻孔中的下更新世三角洲和海洋沉积物
DOI: 10.1002/jqs.3390020202
发表时间: 1987
影响因子: 2.3
作者:
M. Stoker;A. Bent
通讯作者: A. Bent
大西洋东北部哈顿盆地的公里级多边形海底凹陷:对多边形断层起源的限制
DOI: 10.1016/j.margeo.2012.09.013
发表时间: 2012
期刊: Marine Geology
影响因子: 2.9
作者:
C. Berndt;C. Jacobs;Alan E. Evans;A. Gay;G. Elliott;D. Long;K. Hitchen
通讯作者: K. Hitchen
DOI: --
发表时间: 2015
期刊:
影响因子: --
作者:
U. Ebert;W. Saarloos
通讯作者: W. Saarloos
Hikurangi 边缘的海洋弧前延伸:高分辨率 3D 地震数据的新见解
DOI: 10.1029/2017tc004906
发表时间: 2018
期刊: Tectonics
影响因子: 4.2
作者:
Böttner;Geersen;Crutchley;Mountjoy;Krastel
通讯作者: Krastel